I ask cause it's implied that women getting fucked by the zombies turn them into sex slaves. And we do nothing about it.  I mean if they were dead then why aren't there female corpses around the camp. But if the zombies took them somewhere then why isn't there a mission where we find where we took them and organise a plan to save them .  Might be a more fitting climax then whatever was going on with Serena.

Feels like a giant loose end is all I'm saying.